1 /*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/mtd/mtd.h>
14 #include "nodelist.h"
15
16 /* This ought to be in core MTD code. All registered MTD devices
17 without writev should have this put in place. Bug the MTD
18 maintainer */
19 static inline int mtd_fake_writev(struct mtd_info *mtd, const struct kvec *vecs,
20 unsigned long count, loff_t to, size_t *retlen)
21 {
22 unsigned long i;
23 size_t totlen = 0, thislen;
24 int ret = 0;
25
26 for (i=0; i<count; i++) {
27 if (!vecs[i].iov_len)
28 continue;
29 ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
30 totlen += thislen;
31 if (ret || thislen != vecs[i].iov_len)
32 break;
33 to += vecs[i].iov_len;
34 }
35 if (retlen)
36 *retlen = totlen;
37 return ret;
38 }
39
40 int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
41 unsigned long count, loff_t to, size_t *retlen)
42 {
43 if (!jffs2_is_writebuffered(c)) {
44 if (jffs2_sum_active()) {
45 int res;
46 res = jffs2_sum_add_kvec(c, vecs, count, (uint32_t) to);
47 if (res) {
48 return res;
49 }
50 }
51 }
52
53 if (c->mtd->writev)
54 return c->mtd->writev(c->mtd, vecs, count, to, retlen);
55 else {
56 return mtd_fake_writev(c->mtd, vecs, count, to, retlen);
57 }
58 }
59
60 int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
61 size_t *retlen, const u_char *buf)
62 {
63 int ret;
64 ret = c->mtd->write(c->mtd, ofs, len, retlen, buf);
65
66 if (jffs2_sum_active()) {
67 struct kvec vecs[1];
68 int res;
69
70 vecs[0].iov_base = (unsigned char *) buf;
71 vecs[0].iov_len = len;
72
73 res = jffs2_sum_add_kvec(c, vecs, 1, (uint32_t) ofs);
74 if (res) {
75 return res;
76 }
77 }
78 return ret;
79 }
80
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